Burning Demos to DVD.

Okay so I have bought a xbox slim today and I am not sure if it is modded or not. I am wondering if I can download a demo and see if it reads the burned disk but after going on another sight it seems that not all demos burned to disk require a flashed xbox. is their a demo I can download that would require a flashed xbox to play or are all of team playable on even non flashed xbox's? Dont have any dual layer dvd's to make a back up of my only game so I need a demo that can be burned on single layer.

Yea that's what I thought. Damn, I guess I am stuck without being able to update the Xbox til I know for sure its not flashed. By any chance can I do anything like RGH this Xbox because it has an older dashboard 2.0.12625.0 to be exact.

How much do you think it could sell for knowing that it has this dashboard. I remember a while back that you could get alot for a jtag capable xbox so since this is RGH is this worth some money as well?

Since I am at this firmware that means my PCB is still unlocked right? Cus I read after update 2.0.13------ The DVD drive gets locked... Since I dont know if this is flashed or not can I just flash it back to stock and then update it without getting banned. I want to flash it back to stock weather or not it is flashed since I cant tell and I want to do it with only a sata cord and the power from the console itself. I know that flags the system but from what I remember no one gets banned from it. So is it possible to do all that like the phat xbox's? I just really dont want to get banned. I bought this only for Black Ops 2 multiplayer. If its banned its worthless to me.